ASTM E1897-14
(Practice)Standard Practice for Measuring and Compensating for Transmittance of an Attenuating Medium Using Infrared Imaging Radiometers
Standard Practice for Measuring and Compensating for Transmittance of an Attenuating Medium Using Infrared Imaging Radiometers
SIGNIFICANCE AND USE
5.1 The transmittance of an attenuating medium can cause errors for an infrared thermographer using an infrared imaging radiometer to measure the temperature of a specimen through the medium. Three test methods are given for measuring and compensating for this error source.
5.1.1 A procedure is given for measuring the transmittance of an attenuating medium.
5.1.2 A procedure is given for compensating for errors when measuring the temperature of a specimen having a known emissivity through an attenuating medium with a known transmittance.
5.1.3 A procedure is given for measuring and compensating for transmittance and emissivity errors when the specimen temperature is known.
5.2 These procedures can be used in the field or laboratory using commonly available materials.
5.3 These procedures can be used with any infrared radiometers that have the required computer capabilities.
5.4 The values of transmittance are defined only in terms of the procedure for the purpose of process control and nondestructive evaluation of materials.
SCOPE
1.1 This practice covers procedures for measuring and compensating for transmittance when using an infrared imaging radiometer to measure the temperature of a specimen through an attenuating medium, such as a window, filter or atmosphere.2
1.2 The values stated in SI units are to be regarded as the standard.
1.3 These procedures may involve use of equipment and materials in the presence of heated or electrically-energized equipment, or both.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: E1897 − 14
Standard Practice for
Measuring and Compensating for Transmittance of an
1
Attenuating Medium Using Infrared Imaging Radiometers
This standard is issued under the fixed designation E1897; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 3.1.3 filter—a semi-transparent material that attenuates cer-
tain wavelengths of radiation.
1.1 This practice covers procedures for measuring and
3.1.4 infrared thermographer—the person using an infrared
compensating for transmittance when using an infrared imag-
imaging radiometer.
ing radiometer to measure the temperature of a specimen
through an attenuating medium, such as a window, filter or
3.1.5 reflected temperature—the temperature of the energy
2
atmosphere.
incident upon and reflected by the measurement surface of the
specimen.
1.2 The values stated in SI units are to be regarded as the
standard.
3.1.6 window—a semi-transparent material that separates
conditioned and unconditioned atmospheres and attenuates
1.3 These procedures may involve use of equipment and
certain wavelengths of radiation.
materials in the presence of heated or electrically-energized
equipment, or both.
3.2 See also Terminology E1316.
1.4 This standard does not purport to address all of the
4. Summary of Practice
safety concerns, if any, associated with its use. It is the
4.1 Using the computer built into an infrared imaging
responsibility of the user of this standard to establish appro-
radiometer, a method is given for measuring the transmittance
priate safety and health practices and determine the applica-
of an attenuating medium.
bility of regulatory limitations prior to use.
4.2 Using the computer built into an infrared imaging
2. Referenced Documents
radiometer, a method is given for compensating for errors
3
2.1 ASTM Standards:
when measuring the temperature of a specimen through an
E1316 Terminology for Nondestructive Examinations
attenuating medium when the emissivity of the specimen and
the transmittance of the attenuating medium are known.
3. Terminology
4.3 Using the computer built into an infrared imaging
3.1 Definitions of Terms Specific to This Standard:
radiometer, a method is given for measuring and compensating
3.1.1 attenuating medium—a semi-transparent solid, liquid
for unknown transmittance and emissivity errors when the
or gas, such as a window, filter, external optics or an atmo-
specimen temperature is known.
sphere that attenuates radiation.
3.1.2 blackbody simulator—a device with an emissivity
5. Significance and Use
close to 1.00 that can be heated or cooled to a stable
5.1 The transmittance of an attenuating medium can cause
temperature.
errors for an infrared thermographer using an infrared imaging
radiometer to measure the temperature of a specimen through
1
This practice is under the jurisdiction of ASTM Committee E07 on Nonde-
the medium. Three test methods are given for measuring and
structive Testing and is the direct responsibility of Subcommittee E07.10 on
compensating for this error source.
Specialized NDT Methods.
5.1.1 A procedure is given for measuring the transmittance
Current edition approved Dec. 1, 2014. Published December 2014. Originally
approved 1997. Last previous edition approved in 2010 as E1897 – 97 (2010). DOI:
of an attenuating medium.
10.1520/E1897-14.
5.1.2 Aprocedureisgivenforcompensatingforerrorswhen
2
This practice was originally adapted in 1997, by agreement, from the Guideline
measuring the temperature of a specimen having a known
for Measuring and Compensating for Reflected Temperature, Emittance and
emissivity through an attenuating medium with a known
Transmittance developed by Infraspection Institute, 425 Ellis Street, Burlington, NJ
08016.
transmittance.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.1.3 Aprocedure is given for measuring and compensating
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
for transmittance and emissivity errors when the specimen
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. temperature is known.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
E1897 − 14
5.2 These procedures can be used in the field or laboratory men temperature is known requires a calibrated thermometer to
using commonly available materials. measure the temperature of the specimen.
5.3 These procedures can
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: E1897 − 97 (Reapproved 2010) E1897 − 14
Standard Test Methods Practice for
Measuring and Compensating for Transmittance of an
1
Attenuating Medium Using Infrared Imaging Radiometers
This standard is issued under the fixed designation E1897; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 These test methods cover procedures for measuring and compensating for transmittance when using an infrared imaging
radiometer to measure the temperature of a specimen through an attenuating medium, such as a window, filter or atmosphere.
1.2 The values stated in SI units are to be regarded as the standard.
1.3 These test methods may involve use of equipment and materials in the presence of heated or electrically-energized
equipment, or both.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
E1316 Terminology for Nondestructive Examinations
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 attenuating medium—a semi-transparent solid, liquid or gas, such as a window, filter, external optics or an atmosphere that
attenuates radiation.
3.1.2 blackbody simulator—a device with an emissivity close to 1.00 that can be heated or cooled to a stable temperature.
3.1.3 filter—a semi-transparent material that attenuates certain wavelengths of radiation.
3.1.4 infrared thermographer—the person using an infrared imaging radiometer.
3.1.5 reflected temperature—the temperature of the energy incident upon and reflected by the measurement surface of the
specimen.
3.1.6 window—a semi-transparent material that separates conditioned and unconditioned atmospheres and attenuates certain
wavelengths of radiation.
3.2 See also Terminology E1316.
4. Summary of Test Method
4.1 Using the computer built into an infrared imaging radiometer, a method is given for measuring the transmittance of an
attenuating medium.
4.2 Using the computer built into an infrared imaging radiometer, a method is given for compensating for errors when
measuring the temperature of a specimen through an attenuating medium when the emissivity of the specimen and the
transmittance of the attenuating medium are known.
1
These test methods are This practice is under the jurisdiction of ASTM Committee E07 on Nondestructive Testing and is the direct responsibility of Subcommittee E07.10
on Specialized NDT Methods.
Current edition approved June 15, 2010Dec. 1, 2014. Published November 2010December 2014. Originally approved 1997. Last previous edition approved 2002 in 2010
ε1
as E1897 – 97 (2002)(2010). . DOI: 10.1520/E1897-97R10.10.1520/E1897-14.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
E1897 − 14
4.3 Using the computer built into an infrared imaging radiometer, a method is given for measuring and compensating for
unknown transmittance and emissivity errors when the specimen temperature is known.
5. Significance and Use
5.1 The transmittance of an attenuating medium can cause errors for an infrared thermographer using an infrared imaging
radiometer to measure the temperature of a specimen through the medium. Three test methods are given for measuring and
compensating for this error source.
5.1.1 A test method is given for measuring the transmittance of an attenuating medium.
5.1.2 A test method is given for compensating for errors when measuring the temperature of a specimen having a known
emissivity through an attenuating medium with a known transmittance.
5.1.3 A test method is given for measuring and compensating for transmittance and emissivity errors when the specimen
temperature is known.
5.2 These test methods can be used in the field or laboratory using commonly available materials.
5.3 These test method
...
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